4 * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include "chantables.h"
28 #include "condition.h"
29 #include "devicev4l2base.h"
32 #include "preferences.h"
33 #include "recordconfig.h"
34 #include "videodevice.h"
44 #ifdef HAVE_VIDEO4LINUX2
45 #include <linux/videodev2.h>
47 #include <sys/ioctl.h>
52 DeviceV4L2BufferQ(int qsize)
55 bfr_lock = new Mutex("DeviceV4L2BufferQ::bfr_lock");
56 buffers = new int[limit=qsize];
66 int DeviceV4L2BufferQ::q(int bfr)
69 bfr_lock->lock("DeviceV4L2Buffer::q");
71 if( in1 >= limit ) in1 = 0;
83 int DeviceV4L2BufferQ::dq(Condition *time_lock, int time_out)
86 bfr_lock->lock(" DeviceV4L2Buffer::dq 0");
91 if( time_lock->timed_lock(time_out, "DeviceV4L2Buffer::dq 1") )
92 printf("DeviceV4L2Buffer::wait time_out\n");
93 bfr_lock->lock(" DeviceV4L2Buffer::dq 2");
97 result = buffers[out];
99 if( out1 >= limit ) out1 = 0;
106 int DeviceV4L2BufferQ::dq()
109 bfr_lock->lock(" DeviceV4L2Buffer::dq");
112 result = buffers[out];
114 if( out1 >= limit ) out1 = 0;
123 DeviceV4L2Base::DeviceV4L2Base()
126 v4l2_lock = new Mutex("DeviceV4L2Input::v4l2_lock", 0);
127 qbfrs_lock = new Mutex("DeviceV4L2Base::qbfrs_lock");
128 video_lock = new Condition(0, "DeviceV4L2Base::video_lock", 1);
142 DeviceV4L2Base::~DeviceV4L2Base()
152 DeviceV4L2Put::DeviceV4L2Put(DeviceV4L2Base *v4l2)
157 putq = new DeviceV4L2BufferQ(256);
158 buffer_lock = new Condition(0, "DeviceV4L2Put::buffer_lock");
161 DeviceV4L2Put::~DeviceV4L2Put()
163 if(Thread::running())
166 buffer_lock->unlock();
175 void DeviceV4L2Put::run()
179 buffer_lock->lock("DeviceV4L2Put::run");
181 int bfr = putq->dq();
182 if( bfr < 0 ) continue;
183 struct v4l2_buffer arg;
184 memset(&arg, 0, sizeof(arg));
185 arg.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
187 arg.memory = V4L2_MEMORY_MMAP;
189 Thread::enable_cancel();
190 v4l2->qbfrs_lock->lock("DeviceV4L2Put::run");
191 // This locks up if there's no signal.
192 if( v4l2->vioctl(VIDIOC_QBUF, &arg) < 0 )
193 perror("DeviceV4L2Put::run 1 VIDIOC_QBUF");
196 v4l2->qbfrs_lock->unlock();
197 Thread::disable_cancel();
204 int DeviceV4L2Base::get_sources()
206 v4l2_lock->lock("DeviceV4L2Base::get_sources");
207 VideoDevice *video_device = v4l2_device();
208 if( !video_device ) return 1;
209 const char *dev_path = video_device->in_config->get_path();
210 int vfd = open(dev_path, O_RDWR+O_CLOEXEC);
213 perror("DeviceV4L2Base::get_sources open failed");
214 printf("DeviceV4L2Base::get_sources path: %s\n", dev_path);
220 for(int i = 0; i < 20; ++i)
222 struct v4l2_input arg;
223 memset(&arg, 0, sizeof(arg));
226 if(ioctl(vfd, VIDIOC_ENUMINPUT, &arg) < 0) break;
227 Channel *channel = video_device->new_input_source((char*)arg.name);
228 channel->device_index = i;
229 channel->tuner = arg.type == V4L2_INPUT_TYPE_TUNER ? arg.tuner : -1;
232 // Get the picture controls
233 for(int i = V4L2_CID_BASE; i < V4L2_CID_LASTP1; i++)
235 struct v4l2_queryctrl arg;
236 memset(&arg, 0, sizeof(arg));
238 // This returns errors for unsupported controls which is what we want.
239 if(!ioctl(vfd, VIDIOC_QUERYCTRL, &arg))
241 // Test if control exists already
242 if(!video_device->picture->get_item((const char*)arg.name, arg.id))
245 PictureItem *item = video_device->picture->new_item((const char*)arg.name);
246 item->device_id = arg.id;
247 item->min = arg.minimum;
248 item->max = arg.maximum;
249 item->step = arg.step;
250 item->default_ = arg.default_value;
251 item->type = arg.type;
252 item->value = arg.default_value;
257 // Load defaults for picture controls
258 video_device->picture->load_defaults();
265 int DeviceV4L2Base::vioctl(unsigned long int req, void *arg)
267 int result = ioctl(dev_fd, req, arg);
271 int DeviceV4L2Base::v4l2_open(int color_model)
273 VideoDevice *video_device = v4l2_device();
274 if( !video_device ) return 1;
276 struct v4l2_capability cap;
277 memset(&cap, 0, sizeof(cap));
278 if(vioctl(VIDIOC_QUERYCAP, &cap))
279 perror("DeviceV4L2Base::v4l2_open VIDIOC_QUERYCAP");
281 // printf("DeviceV4L2Base::v4l2_open dev_fd=%d driver=%s card=%s bus_info=%s version=%d\n",
282 // dev_fd(), cap.driver, cap.card, cap.bus_info, cap.version);
284 // if( (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) ) printf("VIDEO_CAPTURE ");
285 // if( (cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) ) printf("VIDEO_OUTPUT ");
286 // if( (cap.capabilities & V4L2_CAP_VIDEO_OVERLAY) ) printf("VIDEO_OVERLAY ");
287 // if( (cap.capabilities & V4L2_CAP_VBI_CAPTURE) ) printf("VBI_CAPTURE ");
288 // if( (cap.capabilities & V4L2_CAP_VBI_OUTPUT) ) printf("VBI_OUTPUT ");
289 // if( (cap.capabilities & V4L2_CAP_RDS_CAPTURE) ) printf("RDS_CAPTURE ");
290 // if( (cap.capabilities & V4L2_CAP_TUNER) ) printf("TUNER ");
291 // if( (cap.capabilities & V4L2_CAP_AUDIO) ) printf("AUDIO ");
292 // if( (cap.capabilities & V4L2_CAP_RADIO) ) printf("RADIO ");
293 // if( (cap.capabilities & V4L2_CAP_READWRITE) ) printf("READWRITE ");
294 // if( (cap.capabilities & V4L2_CAP_ASYNCIO) ) printf("ASYNCIO ");
295 // if( (cap.capabilities & V4L2_CAP_STREAMING) ) printf("STREAMING ");
298 int config_width = video_device->in_config->w;
299 int config_height = video_device->in_config->h;
300 int config_area = config_width * config_height;
301 int best_width = config_width;
302 int best_height = config_height;
303 unsigned int best_format = 0;
305 int best_color_model = -1;
307 int driver = video_device->in_config->driver;
309 for( int i=0; i<20; ++i ) {
310 struct v4l2_fmtdesc fmt;
311 memset(&fmt,0,sizeof(fmt));
313 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
314 if( vioctl(VIDIOC_ENUM_FMT,&fmt) != 0 ) break;
315 printf("DeviceV4L2Base::v4l2_open");
316 // printf("format=\"%s\";",&fmt.description[0]);
317 printf(" pixels=\"%4.4s\"; res=\"",(char*)&fmt.pixelformat);
321 switch(fmt.pixelformat)
323 case V4L2_PIX_FMT_UYVY: cmodel = BC_UVY422; merit = 4; break;
324 case V4L2_PIX_FMT_YUYV: cmodel = BC_YUV422; merit = 4; break;
325 case V4L2_PIX_FMT_Y41P: cmodel = BC_YUV411P; merit = 1; break;
326 case V4L2_PIX_FMT_YVU420: cmodel = BC_YUV420P; merit = 3; break;
327 case V4L2_PIX_FMT_YUV422P: cmodel = BC_YUV422P; merit = 4; break;
328 case V4L2_PIX_FMT_RGB24: cmodel = BC_RGB888; merit = 6; break;
329 case V4L2_PIX_FMT_MJPEG:
330 cmodel = BC_COMPRESSED;
331 merit = driver == VIDEO4LINUX2JPEG ? 7 : 0;
333 case V4L2_PIX_FMT_MPEG:
335 merit = driver == VIDEO4LINUX2MPEG ? 7 : 2;
338 if( cmodel >= 0 && merit > best_merit )
341 best_format = fmt.pixelformat;
342 best_color_model = cmodel;
345 for( int n=0; n<20; ++n ) {
346 struct v4l2_frmsizeenum fsz;
347 memset(&fsz,0,sizeof(fsz));
349 fsz.pixel_format = fmt.pixelformat;
350 if( vioctl(VIDIOC_ENUM_FRAMESIZES,&fsz) != 0 ) break;
351 int w = fsz.discrete.width, h = fsz.discrete.height;
352 if( n > 0 ) printf(" ");
355 if( area > config_area ) continue;
356 int diff0 = area - best_area;
357 if( diff0 < 0 ) diff0 = -diff0;
358 int diff1 = area - config_area;
359 if( diff1 < 0 ) diff1 = -diff1;
360 if( diff1 < diff0 ) {
371 printf("DeviceV4L2Base::v4l2_open cant determine best_format\n");
374 case VIDEO4LINUX2JPEG:
375 best_format = V4L2_PIX_FMT_MJPEG;
377 case VIDEO4LINUX2MPEG:
378 best_format = V4L2_PIX_FMT_MPEG;
381 best_color_model = color_model;
382 best_format = cmodel_to_device(color_model);
385 printf(_("DeviceV4L2Base::v4l2_open "
386 " attempting format %4.4s\n"), (char *)&best_format);
388 if(driver == VIDEO4LINUX2JPEG && best_format != V4L2_PIX_FMT_MJPEG)
390 printf(_("DeviceV4L2Base::v4l2_open jpeg driver"
391 " and best_format not mjpeg (%4.4s)\n"), (char *)&best_format);
394 if(driver == VIDEO4LINUX2MPEG && best_format != V4L2_PIX_FMT_MPEG)
396 printf(_("DeviceV4L2Base::v4l2_open mpeg driver"
397 " and best_format not mpeg (%4.4s)\n"),(char *)&best_format);
400 if(config_width != best_width || config_height != best_height)
402 printf(_("DeviceV4L2Base::v4l2_open config geom %dx%d != %dx%d best_geom\n"),
403 config_width, config_height, best_width, best_height);
407 struct v4l2_streamparm v4l2_parm;
408 memset(&v4l2_parm, 0, sizeof(v4l2_parm));
409 v4l2_parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
410 if(vioctl(VIDIOC_G_PARM, &v4l2_parm) < 0)
411 perror("DeviceV4L2Base::v4l2_open VIDIOC_G_PARM");
412 if(v4l2_parm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME)
414 v4l2_parm.parm.capture.capturemode |= V4L2_CAP_TIMEPERFRAME;
415 v4l2_parm.parm.capture.timeperframe.numerator = 1;
416 v4l2_parm.parm.capture.timeperframe.denominator =
417 (unsigned long)((float)1 /
418 video_device->frame_rate * 10000000);
419 if(vioctl(VIDIOC_S_PARM, &v4l2_parm) < 0)
420 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_PARM");
422 if(vioctl(VIDIOC_G_PARM, &v4l2_parm) < 0)
423 perror("DeviceV4L2Base::v4l2_open VIDIOC_G_PARM");
426 // Set up data format
427 struct v4l2_format v4l2_params;
428 memset(&v4l2_params, 0, sizeof(v4l2_params));
429 v4l2_params.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
430 if(vioctl(VIDIOC_G_FMT, &v4l2_params) < 0)
431 perror("DeviceV4L2Base::v4l2_open VIDIOC_G_FMT 1");
432 v4l2_params.fmt.pix.width = best_width;
433 v4l2_params.fmt.pix.height = best_height;
434 v4l2_params.fmt.pix.pixelformat = best_format;
435 if(vioctl(VIDIOC_S_FMT, &v4l2_params) < 0)
436 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_FMT");
437 memset(&v4l2_params, 0, sizeof(v4l2_params));
438 v4l2_params.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
439 if(vioctl(VIDIOC_G_FMT, &v4l2_params) < 0)
440 perror("DeviceV4L2Base::v4l2_open VIDIOC_G_FMT 2");
441 if( v4l2_params.fmt.pix.pixelformat != best_format )
443 printf("DeviceV4L2Base::v4l2_open set format %4.4s != %4.4s best_format\n",
444 (char*)&v4l2_params.fmt.pix.pixelformat, (char*)&best_format);
447 if( (int)v4l2_params.fmt.pix.width != best_width ||
448 (int)v4l2_params.fmt.pix.height != best_height )
450 printf("DeviceV4L2Base::v4l2_open set geom %dx%d != %dx%d best_geom\n",
451 v4l2_params.fmt.pix.width, v4l2_params.fmt.pix.height,
452 best_width, best_height);
456 // Set picture controls. This driver requires the values to be set once to default
457 // values and then again to different values before it takes up the values.
458 // Unfortunately VIDIOC_S_CTRL resets the audio to mono in 2.6.7.
459 PictureConfig *picture = video_device->picture;
460 for(int i = 0; i < picture->controls.total; i++)
462 struct v4l2_queryctrl arg;
463 memset(&arg, 0, sizeof(arg));
464 PictureItem *item = picture->controls.values[i];
465 arg.id = item->device_id;
466 if(!vioctl(VIDIOC_QUERYCTRL, &arg))
468 struct v4l2_control ctrl_arg;
469 memset(&ctrl_arg, 0, sizeof(ctrl_arg));
470 ctrl_arg.id = item->device_id;
472 if(vioctl(VIDIOC_S_CTRL, &ctrl_arg) < 0)
473 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_CTRL");
477 printf("DeviceV4L2Base::v4l2_open VIDIOC_S_CTRL 1 %s/id %08x failed\n",
478 item->name, item->device_id);
483 for(int i = 0; i < picture->controls.total; i++)
485 struct v4l2_queryctrl arg;
486 memset(&arg, 0, sizeof(arg));
487 PictureItem *item = picture->controls.values[i];
488 arg.id = item->device_id;
490 if(!vioctl(VIDIOC_QUERYCTRL, &arg))
492 struct v4l2_control ctrl_arg;
493 memset(&ctrl_arg, 0, sizeof(ctrl_arg));
494 ctrl_arg.id = item->device_id;
495 ctrl_arg.value = item->value;
496 if(vioctl(VIDIOC_S_CTRL, &ctrl_arg) < 0)
497 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_CTRL");
501 printf("DeviceV4L2Base::v4l2_open VIDIOC_S_CTRL 2 %s/id %08x failed\n",
502 item->name, item->device_id);
508 Channel *video_channel = video_device->channel;
509 ArrayList<Channel*> *inputs = video_device->get_inputs();
510 int input = video_channel->input;
511 device_channel = input >= 0 && input < inputs->total ?
512 inputs->values[input] : 0;
518 device_channel = inputs->values[0];
519 printf("DeviceV4L2Base::v4l2_open user channel not found. Using %s\n",
520 device_channel->device_name);
524 printf("DeviceV4L2Base::v4l2_open channel \"%s\" not found.\n",
525 video_channel->title);
529 // Translate input to API structures
530 input = device_channel ? device_channel->device_index : 0;
531 if(vioctl(VIDIOC_S_INPUT, &input) < 0)
532 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_INPUT");
535 v4l2_std_id std_id = 0;
536 switch(video_channel->norm)
538 case NTSC: std_id = V4L2_STD_NTSC; break;
539 case PAL: std_id = V4L2_STD_PAL; break;
540 case SECAM: std_id = V4L2_STD_SECAM; break;
541 default: std_id = V4L2_STD_NTSC_M; break;
543 if(vioctl(VIDIOC_S_STD, &std_id))
544 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_STD");
546 int dev_tuner = device_channel ? device_channel->tuner : -1;
547 if( (cap.capabilities & V4L2_CAP_TUNER) && dev_tuner >= 0 )
549 struct v4l2_tuner tuner;
550 memset(&tuner, 0, sizeof(tuner));
551 tuner.index = dev_tuner;
552 if(!vioctl(VIDIOC_G_TUNER, &tuner))
554 // printf("DeviceV4L2Base::v4l2_open audmode=%d rxsubchans=%d\n",
555 // tuner.audmode, tuner.rxsubchans);
556 tuner.index = dev_tuner;
557 tuner.type = V4L2_TUNER_ANALOG_TV;
558 tuner.audmode = V4L2_TUNER_MODE_STEREO;
559 tuner.rxsubchans = V4L2_TUNER_SUB_STEREO;
560 if(vioctl(VIDIOC_S_TUNER, &tuner) < 0)
561 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_TUNER");
563 struct v4l2_frequency frequency;
564 memset(&frequency, 0, sizeof(frequency));
565 frequency.tuner = video_channel->tuner;
566 frequency.type = V4L2_TUNER_ANALOG_TV;
567 int table = video_channel->freqtable;
568 int entry = video_channel->entry;
569 frequency.frequency = (int)(chanlists[table].list[entry].freq * 0.016);
570 // printf("DeviceV4L2Base::v4l2_open tuner=%d freq=%d norm=%d\n",
571 // video_channel->tuner, frequency.frequency, video_channel->norm);
572 if(vioctl(VIDIOC_S_FREQUENCY, &frequency) < 0)
573 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_FREQUENCY");
576 perror("DeviceV4L2Base::v4l2_open VIDIOC_G_TUNER");
580 if(color_model == BC_COMPRESSED)
582 struct v4l2_jpegcompression jpeg_arg;
583 memset(&jpeg_arg, 0, sizeof(jpeg_arg));
584 if(vioctl(VIDIOC_G_JPEGCOMP, &jpeg_arg) < 0)
585 perror("DeviceV4L2Base::v4l2_open VIDIOC_G_JPEGCOMP");
586 jpeg_arg.quality = video_device->quality / 2;
587 if(vioctl(VIDIOC_S_JPEGCOMP, &jpeg_arg) < 0)
588 perror("DeviceV4L2Base::v4l2_open VIDIOC_S_JPEGCOMP");
591 this->color_model = best_color_model;
595 int DeviceV4L2Base::v4l2_status()
598 Channel *channel = device_channel;
603 else if( channel->tuner >= 0 )
605 struct v4l2_tuner tuner;
606 memset(&tuner,0,sizeof(tuner));
607 tuner.index = channel->tuner;
608 if( !vioctl(VIDIOC_G_TUNER, &tuner) )
610 dev_status = tuner.signal ? 1 : 0;
614 perror("DeviceV4L2Base::v4l2_status VIDIOC_S_TUNER");
618 struct v4l2_input arg;
619 memset(&arg, 0, sizeof(arg));
620 arg.index = channel->device_index;
621 if( !vioctl(VIDIOC_ENUMINPUT, &arg) )
623 dev_status = (arg.status &
624 (V4L2_IN_ST_NO_POWER | V4L2_IN_ST_NO_SIGNAL)) ? 0 : 1;
628 perror("DeviceV4L2Base::v4l2_status VIDIOC_ENUMINPUT");
633 void DeviceV4L2Base::dev_close()
642 int DeviceV4L2Base::dev_open()
646 VideoDevice *video_device = v4l2_device();
649 printf("DeviceV4L2Base::dev_open: video_device not available\n");
653 const char *dev_path = video_device->in_config->get_path();
654 dev_fd = open(dev_path, O_RDWR);
657 perror("DeviceV4L2Base::dev_open: open_failed");
658 printf("DeviceV4L2Base::dev_open: dev_path %s\n", dev_path);
661 video_device->set_cloexec_flag(dev_fd, 1);
667 int DeviceV4L2Base::open_dev(int color_model)
669 v4l2_lock->lock("DeviceV4L2Base::open_dev");
675 result = v4l2_open(color_model);
677 result = start_dev();
682 getq = new DeviceV4L2BufferQ(total_buffers+1);
683 put_thread = new DeviceV4L2Put(this);
689 printf("DeviceV4L2Base::open_dev failed\n");
693 printf("DeviceV4L2Base::open_dev: adaptor open failed\n");
703 void DeviceV4L2Base::close_dev()
705 v4l2_lock->lock("DeviceV4L2Base::close_dev");
708 if(Thread::running())
728 int DeviceV4L2Base::status_dev()
730 v4l2_lock->lock("DeviceV4L2Base::status_dev");
731 int result = dev_fd >= 0 ? v4l2_status() : 1;
736 unsigned int DeviceV4L2Base::cmodel_to_device(int color_model)
740 case BC_COMPRESSED: return V4L2_PIX_FMT_MJPEG;
741 case BC_YUV422: return V4L2_PIX_FMT_YUYV;
742 case BC_UVY422: return V4L2_PIX_FMT_UYVY;
743 case BC_YUV411P: return V4L2_PIX_FMT_Y41P;
744 case BC_YUV420P: return V4L2_PIX_FMT_YVU420;
745 case BC_YUV422P: return V4L2_PIX_FMT_YUV422P;
746 case BC_RGB888: return V4L2_PIX_FMT_RGB24;
751 DeviceV4L2VFrame::DeviceV4L2VFrame(int dev_fd, unsigned long ofs, unsigned long sz)
753 dev_data = (unsigned char*)mmap(NULL, dev_size=sz,
754 PROT_READ | PROT_WRITE, MAP_SHARED, dev_fd, ofs);
755 if(dev_data == MAP_FAILED) {
756 perror("DeviceV4L2VFrame::DeviceV4L2VFrame: mmap");
762 DeviceV4L2VFrame::~DeviceV4L2VFrame()
764 munmap(dev_data, dev_size);
767 int DeviceV4L2Base::start_dev()
769 VideoDevice *video_device = v4l2_device();
770 if( !video_device ) return 1;
772 // Errors here are fatal.
773 int req_buffers = video_device->in_config->capture_length;
774 req_buffers = MAX(req_buffers, 2);
775 req_buffers = MIN(req_buffers, 0xff);
777 struct v4l2_requestbuffers requestbuffers;
778 memset(&requestbuffers, 0, sizeof(requestbuffers));
779 //printf("DeviceV4L2Base::start_dev requested %d buffers\n", req_buffers);
780 requestbuffers.count = req_buffers;
781 requestbuffers.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
782 requestbuffers.memory = V4L2_MEMORY_MMAP;
783 if(vioctl(VIDIOC_REQBUFS, &requestbuffers) < 0)
785 perror("DeviceV4L2Base::start_dev VIDIOC_REQBUFS");
788 int bfr_count = requestbuffers.count;
789 //printf("DeviceV4L2Base::start_dev got %d buffers\n", bfr_count);
790 device_buffers = new DeviceV4L2VFrame *[bfr_count];
791 memset(device_buffers, 0, bfr_count*sizeof(device_buffers[0]));
793 //printf("DeviceV4L2Base::start_dev color_model=%d\n", color_model);
794 int iwidth = video_device->in_config->w;
795 int iheight = video_device->in_config->h;
796 int y_offset = 0, line_size = -1;
797 int u_offset = 0, v_offset = 0;
799 if(color_model != BC_COMPRESSED)
804 u_offset = iwidth * iheight;
805 v_offset = u_offset + u_offset / 2;
809 // In 2.6.7, the v and u are inverted for 420 but not 422
810 v_offset = iwidth * iheight;
811 u_offset = v_offset + v_offset / 4;
817 for(int i = 0; i < bfr_count; i++)
819 struct v4l2_buffer buffer;
820 memset(&buffer, 0, sizeof(buffer));
821 buffer.type = requestbuffers.type;
823 if(vioctl(VIDIOC_QUERYBUF, &buffer) < 0)
825 perror("DeviceV4L2Base::start_dev VIDIOC_QUERYBUF");
829 DeviceV4L2VFrame *dframe =
830 new DeviceV4L2VFrame(dev_fd, buffer.m.offset, buffer.length);
831 unsigned char *data = dframe->get_dev_data();
832 if( !data ) continue;
833 device_buffers[total_buffers++] = dframe;
834 if(color_model != BC_COMPRESSED)
835 dframe->reallocate(data, 0, y_offset, u_offset, v_offset,
836 iwidth, iheight, color_model, line_size);
838 dframe->set_compressed_memory(data, 0, 0, dframe->get_dev_size());
842 for(int i = 0; i < total_buffers; i++)
844 struct v4l2_buffer buffer;
845 memset(&buffer, 0, sizeof(buffer));
846 buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
847 buffer.memory = V4L2_MEMORY_MMAP;
850 if(vioctl(VIDIOC_QBUF, &buffer) < 0)
852 perror("DeviceV4L2Base::start_dev VIDIOC_QBUF");
858 int streamon_arg = V4L2_BUF_TYPE_VIDEO_CAPTURE;
859 if(vioctl(VIDIOC_STREAMON, &streamon_arg) < 0)
861 perror("DeviceV4L2Base::start_dev VIDIOC_STREAMON");
869 int DeviceV4L2Base::stop_dev()
873 int streamoff_arg = V4L2_BUF_TYPE_VIDEO_CAPTURE;
874 if(vioctl(VIDIOC_STREAMOFF, &streamoff_arg) < 0)
875 perror("DeviceV4L2Base::stop_stream_capture VIDIOC_STREAMOFF");
879 for( int i = 0; i < total_buffers; i++ )
881 delete device_buffers[i];
884 struct v4l2_requestbuffers requestbuffers;
885 memset(&requestbuffers, 0, sizeof(requestbuffers));
886 requestbuffers.count = 0;
887 requestbuffers.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
888 requestbuffers.memory = V4L2_MEMORY_MMAP;
889 vioctl(VIDIOC_REQBUFS, &requestbuffers);
891 delete [] device_buffers;
898 void DeviceV4L2Base::run()
900 Thread::disable_cancel();
901 int min_buffers = total_buffers / 2;
902 if( min_buffers > 3 ) min_buffers = 3;
904 // Read buffers continuously
909 while( !done && (!qbfrs || (!retry && qbfrs < min_buffers)) )
911 Thread::enable_cancel();
913 Thread::disable_cancel();
914 ++retry; qbfrs = q_bfrs;
917 struct v4l2_buffer buffer;
918 memset(&buffer, 0, sizeof(buffer));
919 buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
920 buffer.memory = V4L2_MEMORY_MMAP;
922 // The driver returns the first buffer not queued, so only one buffer
923 // can be unqueued at a time.
924 Thread::enable_cancel();
925 qbfrs_lock->lock("DeviceV4L2Base::run");
926 int result = vioctl(VIDIOC_DQBUF, &buffer);
927 if( !result ) --q_bfrs;
928 qbfrs_lock->unlock();
929 Thread::disable_cancel();
932 perror("DeviceV4L2Base::run VIDIOC_DQBUF");
933 Thread::enable_cancel();
935 Thread::disable_cancel();
940 int bfr = buffer.index;
941 // Set output frame data size/time, queue video
942 VFrame *frame = device_buffers[bfr];
943 if(color_model == BC_COMPRESSED)
944 frame->set_compressed_size(buffer.bytesused);
945 struct timeval *tv = &buffer.timestamp;
946 double bfr_time = tv->tv_sec + tv->tv_usec / 1000000.;
947 frame->set_timestamp(bfr_time);
948 if( !getq->q(bfr) ) video_lock->unlock();